Apparatus for treating articles of paper, cardboard, and the like with waterproofing material.



A. STEPHEN. APPARATUS FOR TREATING ARTICLES OF PAPER, CARDBOARD, AND THELIKE WITH WATERPROOFING MATERTALAJ? APPLICATION FILED JAN. 9, 1913l,l%@,@2@., Patented May 25, 1915.

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s wg m gg I .diagrammatically barren era-eras rampant ALEXANDER STEPHEN,(3F LQND ON, ENGLAND- APPARATUS FOR TREATING atc es.

' Specification of Letters Patent.

ARTICLES OF PAPER, CARDBOARE, AND THE LIIKAE WITH WATERPROOFINGMATERIAL.

Patented ma a, from,

Application filed January 9, 1913. Serial No. Maser.

T 0 all whom it may concern: 7

Be it known that I. ALEXANDER STEPHEN, a sub ect of the King of GreatBritam, re-

siding 'at London, England, have invented a been made up into boxes, orother recep-' tacles, with wax or other similar material or compoundwhich is capable of being liquefied by the application of heat.

My approved apparatus consists of (a) a vessel in which the impregnatingmaterial or compound is maintained in a liquefied condition at atemperature of from 120 to 200 degrees Fahrenheit, and into which thearticles to be treated are dipped or plunged; (b) an impregnating anddraining cham ber of special shape heated to a tempera ture of from 140to 24:0 degrees Fahrenheit, through which the articles are caused totravel as the impregnation is completed in a thorough manner, and thesuperfluous impregnating material is removed; and (a) a traversingsurface which receives the articles as they leave the impregnating anddraining chamber, and upon which they are retained until theimpregnating material or compound has completely set. The temperaturesof the impregnating material or compound and of the impregnating anddraining chamber may be varied according to the impregnating material orcompound employed, and according to the desired quality and finish ofthe articles treated.

The accompanying drawing illustrates apparatus constructed according tomy invention, Figure 1 being a side elevation, and Fig; 2 a transversesection on line XX of Fig. 1.

The vessel in which the impregnating material or compound is melted andmaintained at the required temperature consists of a bath or copper clfurnished with a jacket 6 in which air is circulated and heated by a gasring or other suitableburner f, the heat from which may be directed byany convenient form or arrangement of battle plates. A second jacket 9preferably embraces the first acket e and contains asbestos or othernonconducting material to prevent the known manner.

wasteful radiation bf heat. The bath or copper cZ contalnmg theimpregnating material or compound I, is situated preferably at one endof the impregnating and draining chamber as shown in h ig. l. Thischamber a may be constructed of sheet iron and of any suitable length.It is open at each end, I

but doors 7' and 7c are provided at the lowest part thereof which may bekept closed when it is desired to raise the temperature of the interior,or when the apparatus is not in use.

The chamber t' is fitted with an endless traversing surface which mayconveniently consist of a seriesof endless brass chains m running ingrooves n in rotating rollers 0 which may be driven by gearing or beltsoutside the chamber 2' in any suitable or convenient manner. One ofthese rollers 0 may be situated near the bottom or floor of the chain:

' her i at each end thereof, and two others at a convenient distanceapart and from the roof p of the central portion of the said chamber, asshown in the drawing, in such a. manner that when the articles undertreatment are removed from the bath or copper (Z they may be laid on thechains m at the I inlet end of the chamber 2' and be carried in anupwardly inclined direction to the upper central part thereof, then in amore or less horizontal direction through such upper central part, anddown a second incline to the outlet end of the chamber as indicated byarrows in Fig. 1. \Vhen they reach the outlet end of the chamber 2',they leave the chains m, and are automatically received by another.endless traversing surface which may conveniently consist of a series ofend- -less brass chains 9 running over groovedrollers 1' as before,which convey the impregnated articles ina horizontal dIIGCtlOH for aconvenient space in the open air, where the articles are cooled and theimpregnating material is completely set 1' This cooling may beaccelerated by the employment of rotary or other fans, or in some casesthe articles may be passed through a second chamber where they arechilled in any convenient The chains m and 9 may be 'provided withprojections at convenient distances apart in order to insure the forwardtravel of the articles under treatment.

The floor of the'impregnating and draining chamber 2' forms a tray 8which is preferably inclined toward the copper d, ter

minating in a spout t. The tray 3 is pro vided with ajacket a throughwhich heated air is circulated. For this purpose the jacket u may beconnected by any convenient number of pipes or conduits o with theheated air jacket 6 of thecopper d, and also with the u'ptakes w of orother suitable'burn ers 00 contained within the hoods or casings ywhichare situated underneath the chamber nected at the outlet end of thechamber 5 with the interior of the said chamber, or by other suitablepipes or conduits with the heated air jacket 6 of the bath or copper rl,in such a manner as to insure an inclosed or continuous circulation ofheated air. The interior of the chamber 2' may be also further heated bythe admission of heated air directly from the jacket 6 of the copper atby means of the pipes such as shown at a for example in Fig. 1, and alsofrom the hoods or casings y ofthe burners m by means of the uptalresfl.

The exterior surfaces of the ehamberz' are preferably. coated orclothedwith asbestos or other suitable non-conducting material for maintaininga regular and high tern perature within the said chamber, andinspectiondoois, such as shown for example at 3 in Fig. 1, may beprovided'in the walls or root of the chamber at convenient positions. g

The, chamber 2' may be supported by frames l. After the chamber 6 andthe contents of the bath or copper d have been raised to the necessarytemperature, the articles to be treated are first dipped or plunged intothe heated liquid contents of-the bath or copper (Z, and are then liftedout and placed on the endless chains m at the entrance oi the chamber Asthey are raised by the said chains toward the upper central part otthechamber a, and. travel along the same, and down to the outlet end, the

"1'} heated condition of the chamber causes thorough impregnation totake place, and also 2. The jacket u of the tray 5 maybe concausesanysuperfluous impregnating material to drain oil. and fall on to thetray s,

which being suitably inclined toward the copper cl, returns the saidsuperfluous material thereinto to be used again.

The object of making the chamber 2' of the shape described and shown, isto provide above the horizontal space immediately between the entry andexit openings-at j andla an upper space which forms a pocket in whichthe heated air accumulates, and is, comparatively speaking, unaffectedby the cooling of the lower stratum of air due to end walls thereof of aconveyor adapted to receive the articles to be treated at the inletopening and' convey same in an upward direction to the top of saidpocket, then By this arrangement. of chamber a in a horizontal pathalong the upper part of said pocket and finally in' a downward directionto said outlet opening, a trough for receiving the superfluouswaterproofing material while the articles aresoconveyed and returningthe same to the vesselcon taining the waterproofing material and meansfor heating said trough and saidvessel, substantially as speelfied.

In. testimony whereof I have signedmy name to this specification in thepresence of two subscribing witnesses. 7 ALEXANDER STEPHEN.

- Witnesses: i r

STEPHEN EDWARD GUNYON, O. J. WORTH.

